Color cathode ray tube apparatus

Details Color cathode ray tube apparatus Color cathode ray tube apparatus

2007-12-25

2007-12-25

Barrera, Ramon M. (Department: 2832)

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

C335S211000, C335S212000

Reexamination Certificate

active

11522762

ABSTRACT:
In the vicinity of an end on the side of a large diameter portion of a deflection device, a pair of first permanent magnets for converging three electron beams in an X-axis direction and a pair of second permanent magnets for diverging them in the X-axis direction are provided. Inclination coefficients KTBHand KEWHof the distribution curve near the Z axis on the X axis of the Y-axis direction magnetic flux density of the magnetic fields respectively formed by the pair of first permanent magnets and the pair of second permanent magnets satisfy KTBH/KEWH<10 in at least one location within a range of 3 to 13 mm on the side of the phosphor screen with respect to a reference line in the Z-axis direction. An inclination coefficient KHof the distribution curve near the Z axis on the X axis of the Y-axis direction magnetic flux density of a combination magnetic field formed by the pair of first permanent magnets and the pair of second permanent magnets and an inclination coefficient KVof the distribution curve near the Z axis on the Y axis of the X-axis direction magnetic flux density of the combination magnetic field are both larger than 1.5 (Gauss/cm) in at least one location within the above-noted range. This achieves excellent spot shapes, thus making it possible to reduce change in convergence characteristics due to temperature variation and pincushion distortion of right and left rasters.

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patent: 2002-260558 (2002-09-01), None

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